摘要
在不同的黄土地区选取4个工点的典型路堑高边坡,基于点估计理论和有限元强度折减法计算边坡可靠指标。结果表明:工点2的稳定系数虽达到1.46,却有19.2%的失效概率;工点1和4的坡型、地层岩性及层厚等工况较接近,失效概率差值达29.8%,参数变异性是造成其差异的主要原因。用点估计法计算边坡可靠度,并采用可靠度理论分析黄土边坡稳定性,能较好的解决土性参数离散性对边坡稳定性评价的影响。
Based on the point estimate method and finite element strength reduction method,this paper calculates the reliability indexes of 4 typical cutting slopes in different loess regions.The results show that： the stability coefficient of case 2 is 1.46,but its failure probability is 19.2%;although case 1and 4are similar in slope type,the lithology and layer thickness,etc,the difference between their failure probabilities can reach 29.8%,parameter variation is the main reason of causing the difference.Using point estimation method to calculate slope reliability can be an appropriate way to solve the problem that soil parameters discreteness influences slope stability assessment.
出处
《工程地质学报》
CSCD
北大核心
2011年第4期615-619,共5页
Journal of Engineering Geology
关键词
黄土边坡
有限元强度折减法
点估计法
可靠度
失效概率
Loess slope
Finite element strength reduction method
Point estimate method
Reliability
Failure probability
